reserved.variables.server.html
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html> <head> <title>Server and execution environment information</title> <meta http-equiv="content-type" content="text/html; charset=UTF-8"> </head> <body><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="reserved.variables.globals.html">$GLOBALS</a></div> <div class="next" style="text-align: right; float: right;"><a href="reserved.variables.get.html">$_GET</a></div> <div class="up"><a href="reserved.variables.html">Predefined variables</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div><hr /><div id="reserved.variables.server" class="refentry"> <div class="refnamediv"> <h1 class="refname">$_SERVER</h1> <h1 class="refname">$HTTP_SERVER_VARS [deprecated]</h1> <p class="refpurpose"><span class="refname">$_SERVER</span> -- <span class="refname">$HTTP_SERVER_VARS [deprecated]</span> — <span class="dc-title">Server and execution environment information</span></p> </div> <div class="refsect1 description"> <h3 class="title">Description</h3> <p class="para"> <var class="varname">$_SERVER</var> is an array containing information such as headers, paths, and script locations. The entries in this array are created by the web server. There is no guarantee that every web server will provide any of these; servers may omit some, or provide others not listed here. That said, a large number of these variables are accounted for in the <a href="http://hoohoo.ncsa.uiuc.edu/cgi/env.html" class="link external">» CGI 1.1 specification</a>, so you should be able to expect those. </p> <p class="simpara"> <var class="varname">$HTTP_SERVER_VARS</var> contains the same initial information, but is not a <a href="language.variables.superglobals.html" class="link">superglobal</a>. (Note that <var class="varname">$HTTP_SERVER_VARS</var> and <var class="varname">$_SERVER</var> are different variables and that PHP handles them as such) </p> <p class="simpara"> You may or may not find any of the following elements in <var class="varname">$_SERVER</var>. Note that few, if any, of these will be available (or indeed have any meaning) if running PHP on the <a href="features.commandline.html" class="link">command line</a>. </p> <p class="para"> <dl> <dt> <span class="term">'<var class="varname">PHP_SELF</var>'</span> <dd> <span class="simpara"> The filename of the currently executing script, relative to the document root. For instance, <var class="varname">$_SERVER['PHP_SELF']</var> in a script at the address <var class="filename">http://example.com/test.php/foo.bar</var> would be <var class="filename">/test.php/foo.bar</var>. The <a href="language.constants.predefined.html" class="link">__FILE__</a> constant contains the full path and filename of the current (i.e. included) file. </span> <span class="simpara"> If PHP is running as a command-line processor this variable contains the script name since PHP 4.3.0. Previously it was not available. </span> </dd> </dt> <dt> <span class="term">'<a href="reserved.variables.argv.html" class="link">argv</a>'</span> <dd> <span class="simpara"> Array of arguments passed to the script. When the script is run on the command line, this gives C-style access to the command line parameters. When called via the GET method, this will contain the query string. </span> </dd> </dt> <dt> <span class="term">'<a href="reserved.variables.argc.html" class="link">argc</a>'</span> <dd> <span class="simpara"> Contains the number of command line parameters passed to the script (if run on the command line). </span> </dd> </dt> <dt> <span class="term">'<var class="varname">GATEWAY_INTERFACE</var>'</span> <dd> <span class="simpara"> What revision of the CGI specification the server is using; i.e. '<i>CGI/1.1</i>'. </span> </dd> </dt> <dt> <span class="term">'<var class="varname">SERVER_ADDR</var>'</span> <dd> <span class="simpara"> The IP address of the server under which the current script is executing. </span> </dd> </dt> <dt> <span class="term">'<var class="varname">SERVER_NAME</var>'</span> <dd> <span class="simpara"> The name of the server host under which the current script is executing. If the script is running on a virtual host, this will be the value defined for that virtual host. </span> </dd> </dt> <dt> <span class="term">'<var class="varname">SERVER_SOFTWARE</var>'</span> <dd> <span class="simpara"> Server identification string, given in the headers when responding to requests. </span> </dd> </dt> <dt> <span class="term">'<var class="varname">SERVER_PROTOCOL</var>'</span> <dd> <span class="simpara"> Name and revision of the information protocol via which the page was requested; i.e. '<i>HTTP/1.0</i>'; </span> </dd> </dt> <dt> <span class="term">'<var class="varname">REQUEST_METHOD</var>'</span> <dd> <span class="simpara"> Which request method was used to access the page; i.e. '<i>GET</i>', '<i>HEAD</i>', '<i>POST</i>', '<i>PUT</i>'. </span> <blockquote><p><b class="note">Note</b>: PHP script is terminated after sending headers (it means after producing any output without output buffering) if the request method was <i>HEAD</i>. <br /> </p></blockquote> </dd> </dt> <dt> <span class="term">'<var class="varname">REQUEST_TIME</var>'</span> <dd> <span class="simpara"> The timestamp of the start of the request. Available since PHP 5.1.0. </span> </dd> </dt> <dt> <span class="term">'<var class="varname">QUERY_STRING</var>'</span> <dd> <span class="simpara"> The query string, if any, via which the page was accessed. </span> </dd> </dt> <dt> <span class="term">'<var class="varname">DOCUMENT_ROOT</var>'</span> <dd> <span class="simpara"> The document root directory under which the current script is executing, as defined in the server's configuration file. </span> </dd> </dt> <dt> <span class="term">'<var class="varname">HTTP_ACCEPT</var>'</span> <dd> <span class="simpara"> Contents of the <i>Accept:</i> header from the current request, if there is one. </span> </dd> </dt> <dt> <span class="term">'<var class="varname">HTTP_ACCEPT_CHARSET</var>'</span> <dd> <span class="simpara"> Contents of the <i>Accept-Charset:</i> header from the current request, if there is one. Example: '<i>iso-8859-1,*,utf-8</i>'. </span> </dd> </dt> <dt> <span class="term">'<var class="varname">HTTP_ACCEPT_ENCODING</var>'</span> <dd> <span class="simpara"> Contents of the <i>Accept-Encoding:</i> header from the current request, if there is one. Example: '<i>gzip</i>'. </span> </dd> </dt> <dt> <span class="term">'<var class="varname">HTTP_ACCEPT_LANGUAGE</var>'</span> <dd> <span class="simpara"> Contents of the <i>Accept-Language:</i> header from the current request, if there is one. Example: '<i>en</i>'. </span> </dd> </dt> <dt> <span class="term">'<var class="varname">HTTP_CONNECTION</var>'</span> <dd> <span class="simpara"> Contents of the <i>Connection:</i> header from the current request, if there is one. Example: '<i>Keep-Alive</i>'. </span> </dd> </dt> <dt> <span class="term">'<var class="varname">HTTP_HOST</var>'</span> <dd> <span class="simpara"> Contents of the <i>Host:</i> header from the current request, if there is one. </span> </dd> </dt> <dt> <span class="term">'<var class="varname">HTTP_REFERER</var>'</span> <dd> <span class="simpara"> The address of the page (if any) which referred the user agent to the current page. This is set by the user agent. Not all user agents will set this, and some provide the ability to modify <var class="varname">HTTP_REFERER</var> as a feature. In short, it cannot really be trusted. </span> </dd> </dt> <dt> <span class="term">'<var class="varname">HTTP_USER_AGENT</var>'</span> <dd> <span class="simpara"> Contents of the <i>User-Agent:</i> header from the current request, if there is one. This is a string denoting the user agent being which is accessing the page. A typical example is: <span class="computeroutput">Mozilla/4.5 [en] (X11; U; Linux 2.2.9 i586)</span>. Among other things, you can use this value with <a href="function.get-browser.html" class="function">get_browser()</a> to tailor your page's output to the capabilities of the user agent. </span>⌨️ 快捷键说明
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